&aspectratiochanges the aspect ratio on the publisher side. Floating point value; 1.777777 is common; not supported by all browsers.
&aspectratioworks with screen-shares, so you can force crop an incoming screen-share to be a certain aspect ratio. If
&screenshareaspectratiois used it will apply to just screen-shares. If
&screenshareaspectratiodoes not have a value passed, it's assumed to be set as "default", which overrides
&aspectratiooption, if used also.